Be careful not to fall prey to fraud or deceive anyone yourself as it will only lead to your destruction, Muslims will be told on Friday.
Friday's sermon highlights methods of deceit. "Deceit can take some other forms like altering validity dates on food items or generally engaging in foodstuff quality fraud," worshippers will be told.
The sermon also warns against taking unwise loans and ending in "an abyss of worries and an endless disgrace".
"Dear Muslims, our Prophet rejected those who cheat others," it continues, "so stay alert for fraudulent people who attempt to win people's sympathy by pretending to be wretched and poor, or through phone scams."
On beggars, the Prophet Mohammed said in a hadith: "A man who persists in begging people to give him charity, will come on the Day of Judgment and there will not be a piece of flesh on his face."
Islamic law focuses on protecting people's possessions by forbidding unlawful income.
A Quranic verse says: "O you who have believed, do not consume one another's wealth unjustly.
Another says: "O mankind, eat from whatever is on earth [that is] lawful and good and do not follow the footsteps of Satan. Indeed, he is to you a clear enemy."